Rounding to the nearest 10s
What is 31 rounded to the nearest tens?
30
What is 102 rounded to the nearest hundreds?
100
Use the Close Number strategy to estimate 23 + 17
20+20=40 or 25+20=45 or 20+15=35
About how many is 46?
50 or 45 or 40
Amy wanted to bring enough pencils for all the students in Ms. Kelly's class. There are 21 students in the class, about how many should she get?
20 or 25
What is 56 rounded to the nearest tens?
60
What is 172 rounded to the nearest hundreds?
200
Use the Close Number strategy to estimate 44+11
40+10=50 or 45+10=45 or another reasonable answer
About how many is 369?
400 or 350 or 300
Mr. Jake ordered pizza for the morning tutorial students. There are 17 students in the group. About how many slices of pizza should he order?
20 (or 15, that would mean some students get no pizza)
What is 45 rounded to the nearest tens?
50
What is 789 rounded to the nearest hundreds?
800
Use the Close Number strategy to estimate 113 +38
110+40=150 or 100+40=140 or another reasonable answer
About how many is 458?
400 or 450 or 500
Ms. Jessica wanted to order coloring books for the entire school. There are 2,612 students in all. About how many should she order?
2,500 or 2,600 or 3,000
What is 15 rounded to the nearest tens?
20
What is 541 rounded to the nearest hundreds?
500
Use the Close Number strategy to estimate 145+371
100+400=500 or 150+400=550 or another reasonable answer
About how many is 22?
20 or 25
Ms. Smith wanted to bring carrots to all of her son Jack's friends. He has 76 friends. About how many carrots should she buy?
80 (or 70 or 75)
What is 197 rounded to the nearest tens?
200
What is 951 rounded to the nearest hundreds?
1,000
Use the Close Number strategy to estimate 622+519
600+500=1,100 or 620+520=1,140 or another reasonable answer
about how many is 1,904
1,900 or 2,000
Cathy scored 989 goals for her soccer team. (She is veryyyyy good!). The newspaper wrote a story about her. About how man goals could they say Cathy scored?
1,000 or 990